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Monday, 16 January 2017

20.4 (Sort points in a plane)
Write a program that meets the following requirements:
■ Define a class named Point with two data fields x and y to represent a point’s x- and y-coordinates.
Implement the Comparable interface for com- paring the points on x-coordinates. If two points have the
same x-coordinates, compare their y-coordinates.
■ Define a class named CompareY that implements Comparator<Point>. Implement the compare method to
compare two points on their y-coordinates. If two points have the same y-coordinates, compare their x-coordinates.
■ Randomly create 100 points and apply the Arrays.sort method to display the points in increasing
order of their x-coordinates and in increasing order of their y-coordinates, respectively.